Method of forming paper articles.



G. J. BOHLMAN.

METHOD :OF FORNHNG PAPER ARTICLES. n,

APPLlcATioN mso Fes. 19. 1915.

., Patented Mar. 14, 1916.

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piuTTn sTTTns TTTENT ortica.

GEORGE J. BOHLMAN, OF MEDFORD, MASSACHUSETTS, ASSG-NOR TO AMERICAN WATER SUPPLY CO., OF BOSTON, MASSACHUSETTS, A CORPORATION 0F MAINE.

Specification of Letters Patent.

Original application filed November 2, 1914, Serial No. 869,763.v Divided and this application led February 19, 1915. Serial No. 9,261.

To all fwhom t 'may concern:

Be it known that I, GEORGE J. BOHL'MAN, a citizen of the United States, residing at Medford, in the county of Middlesex and State of Massachusetts, have invented an Improvement in the Methods of Forming Paper Articles, of which the following is a specification.

This invention relates to the manufacture of articles of paper, such for instance, as paper drinking cups, and is a division of my application #869,763, filed November 2, 1914. The article herein illustrated is the paper drinking cup of my said application. The characteristic novel feature of said cup is a rolled edge at either or both ends of its body. The cup, together. with its rolled edge, is rendered substantially waterproof by treatment with paraffin waxy, and the present invention has for its object, a novel method of manufacturing cups which is adaptable to other` articles composed of paper, said method being a simple one and requiring but little paraiiin.

In carrying out my invention, the cup body or other article is formed in any usual or suitable manner, and in case of a cup, its bottom piece is arranged therein, and while said cup-body is on the form on which it is made, or on a similar form, the parafn is appliedto it in the form of a liquid spray at a high temperature, which is caused to spread over its entire outer surface, and, as a result, the paper becomes saturated as well as coated with a layer of uniform thickness, and is, therefore, in temper, and while in such condition, it can be easily bent and slightly stretched without breaking. VW'hile said body is in temper, one or both of its end-portions are subjected to a suitable bending or edge-rolling device, by which they are rolled over, thereby to produce ia rolled edge at either or both ends, and then said body is allowed to cool and the parailin to set or congeal, whereupon the paper becomes quite stiff and its rolled edge becomes permanently set.

Figure l, is a side elevation and partial longitudinal vertical section of a paper drinking cup having both of its ends rolled by the method herein involved. Fig. 2, is a similar view of a paper drinking cup, its upper edge only being rolled. Fig. 3, is a side elevation of a paper cup before its edges are rolled, and illustrating the sprays or jets of paraiiin wax which are being directed upon the cup-body, and the molds or forms which serve as bending-devices. Fig. 4, is a similar view showing the cup-body with its endportions rolled over. Y y v l0 represents a paper cup-body, and 1Q a bottom-closure therefor, both of which may be of any well-known or suitable construction. After `the body is produced, it is placed on a form 15, or while reposing on the form on which it is madefa spray or jet of melted parafiin Wax, indicated at 16, is

directed upon it, 'which-is extended over its entire surface, and which acts to coat the body but more particularly to saturate the paper, so that it is in good temper, and may be easily bent without breaking. While the cup-body is in temper, its Iends are rolled over by a suitable stretching and bendingdevice, such for instance, as represented in Fig. 3, wherein a plate 2O is arranged at the bottom of the form 15 having a shallowr groove 21, semicii'cular in cross-section,`

adapted to receive the lower end of the cup body, and by a slight downward pressure upon said body its end-portion or edge is caused to follow the curved wall of said groove and thereby to stretch and bend outwardly, upwardly and then inwardly, substantially completing a circle, although the distance said bend is continued may vary more or less. Also, a similarly grooved plate 30, is or may be arranged above the forrn,4 the groove 31 of which receives the upper end-portion of the cup-body, as said plate and form are moved one toward the other, with the result that said end-portion is similarly bent. After the bend or bends are formed the cup-body is allowed to cool whereupon the parafhn congeals, and the paper is caused to remain in the position in which it is bent, becoming permanently set. The rolled edge or edges thus formed are quite stiff, and are coated with a layer of uniform thickness' on the underside with Wax, and although of lsmall diameter they are sufficiently rigid to prevent the edge being broken by any pressure or strain upon them to which they are ordinarily subjected,

the article of paper, then simultaneously` saturating and heating the paper with melted paralin wax, and while the paper is thus saturated, and in a temper, stretching and bending it into the desired form and then allowing the article to cool, whereupon the paraffin congeals and the article thus formed becomesflpermanently set.

3. The method herein described of 'forming rolled edges on cup-bodies, which consists in forming the cup-body, subsequently applying to the outside of said body, melted l l paraffin wax, which saturates the cf'mposlng the cup-body, tire length, and while the Paper throughout itsenpaper is thus saturated and in temper, bending .the end-portion of the body to form a rolled edgeand then allowing said body to cool whereupon the parafin congeals and the rolled edge becomes permanently set.

4. The method herein described of forming rolled edges on cup-bodies, which consists in forming the cup-body, subsequently applying to the outside of said body, melted paraliin WaX, which saturates and simultaneously-heats the paper, composing the cupbody, throughout its entire length, and while the paper is thus saturated and in temper, stretching and bending the end-portion of the body to form a rolledV edge and then allowing said body to cool, whereupon the paralin congeals and the rolled edge becomes permanently set. v

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

GEGRGE J. BOHLMAN. Witnesses KATHERINE G. MONAMARA, AMos L. TAYLOR. 

